It remains to be seen if Blue will play this Sunday, but the hemming and hawing proves that Deuce Vaughn never had a shot to crack the RB rotation. The Cowboys put rookie Phil Mafah on injured reserve seemingly to avoid subjecting him to the waiver wire. Former Cowboys RB Deuce Vaughn signs to the Broncos practice squadOf course it was Sean Payton that took a flier on Vaughn. Like Vaughn, Sproles was undersized for the position at 5'6", 190 pounds. While Sproles had a lot more raw athleticism, the Cowboys didn't exactly use Vaughn correctly under Mike McCarthy.